Commit 2c90fe2b authored by Kirill Batuzov's avatar Kirill Batuzov Committed by Blue Swirl
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Speedup 'tb_find_slow' by using the same heuristic as during memory page lookup 



Move the last found TB to the head of the list so it will be found more quickly next time it will be looked for.

Signed-off-by: default avatarKirill Batuzov <batuzovk@ispras.ru>
Signed-off-by: default avatarPavel Yushchenko <pau@ispras.ru>
Signed-off-by: default avatarBlue Swirl <blauwirbel@gmail.com>
parent 53016fa6

cpu-exec.c

+6 −0
Original line number Diff line number Diff line
@@ -167,6 +167,12 @@ static TranslationBlock *tb_find_slow(target_ulong pc, 
    tb = tb_gen_code(env, pc, cs_base, flags, 0);



 found:

    /* Move the last found TB to the head of the list */

    if (likely(*ptb1)) {

        *ptb1 = tb->phys_hash_next;

        tb->phys_hash_next = tb_phys_hash[h];

        tb_phys_hash[h] = tb;

    }

    /* we add the TB in the virtual pc hash table */

    env->tb_jmp_cache[tb_jmp_cache_hash_func(pc)] = tb;

    return tb;